Mozilla says Firefox 84 brings “dramatic performance improvements” over the non-native build that shipped with Firefox 83 from November, a week after Apple released its first silicon M1 Macs. . Users with new M1 Macs need to fully exit and restart Firefox after upgrading to Firefox 84 to run the browser on the new architecture.
Link: Firefox 84 arrives: Apple silicon M1 Mac native support brings big speed boost, says Mozilla
via http://www.zdnet.com